It may also be that Verne had little to do with this volume; Hetzel may have edited the collection so that it would count as one of the required volumes Verne was to produce annually. The correspondence archives may shed some light.
Ms. Wilbur also translated other articles on ballooning from the French. It is also interesting that she retained in her translation the original units which Verne used (metre, feet, leagues), a practice forgotten until recently. This may be the first appearance of a work by Jules Verne in the English language.
Translated from the French by Anne T. Wilbur
My Ascension at Frankfort--The Balloon, the Gas, the Apparatus, the Ballast--An Unexpected Travelling Companion--Conversation in the Air--Anecdotes--At 800 Metres[A]--The Portfolio of the Pale Young Man--Pictures and Caricatures--Des Rosiers and d'Arlandes--At 1200 Metres--Atmospheric Phenomena--The Philosopher Charles--Systems--Blanchard--Guyton-Morveaux--M. Julien--M. Petin--At 1500 Metres--The Storm--Great Personages in Balloons--The Valve--The Curious Animals--The Aerial Ship--Game of Balloons.
[Footnote A: A metre is equal to 39.33 English inches.]
In the month of September, 1850, I arrived at Frankfort-on-the-Maine. My passage through the principal cities of Germany, had been brilliantly marked by aerostatic ascensions; but, up to this day, no inhabitant of the Confederation had accompanied me, and the successful experiments at Paris of Messrs. Green, Godard, and Poitevin, had failed to induce the grave Germans to attempt aerial voyages.
Meanwhile, hardly had the news of my approaching ascension circulated throughout Frankfort, than three persons of note asked the favour of accompanying me. Two days after, we were to ascend from the Place de la Comédie. I immediately occupied myself with the preparations. My balloon, of gigantic proportions, was of silk, coated with gutta percha, a substance not liable to injury from acids or gas, and of absolute impermeability. Some trifling rents were mended: the inevitable results of perilous descents.
The day of our ascension was that of the great fair of September, which attracts all the world to Frankfort. The apparatus for filling was composed of six hogsheads arranged around a large vat, hermetically sealed. The hydrogen gas, evolved by the contact of water with iron and sulphuric acid, passed from the first reservoirs to the second, and thence into the immense globe, which was thus gradually inflated. These preparations occupied all the morning, and about 11 o'clock, the balloon was three-quarters full; sufficiently so;--for as we rise, the atmospheric layers diminish in density, and the gas, confined within the aerostat, acquiring more elasticity, might otherwise burst its envelope. My calculations had furnished me with the exact measurement of gas required to carry my companions and myself to a considerable height.